Datasheet
SGLS211A − OCTOBER 2003 − REVISED MAY 2008
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
RS-485
V
O
V
oa
, V
ob
| V
OD1
| V
o
| V
OD2
| V
t
(R
L
= 54 Ω)
| V
OD3
|
V
t
(test termination
measurement 2)
∆ | V
OD
| || V
t
| − | V
t
||
V
OC
| V
os
|
∆ | V
OC
| | V
os
− V
os
|
I
OS
None
I
O
I
ia
, I
ib
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN
TYP
†
MAX UNIT
V
IT+
Positive-going input threshold
voltage
V
O
= 2.7 V, I
O
= −0.4 mA 0.2 V
V
IT−
Negative-going input threshold
voltage
V
O
= 0.5 V, I
O
= 8 mA −0.2
‡
V
V
hys
Hysteresis voltage (V
IT+
− V
IT−
)
(see Figure 4)
50 mV
V
IK
Enable-input clamp voltage I
I
= −18 mA −1.5 V
V
OH
High-level output voltage
V
ID
= 200 mV,
I
OH
= −400 A,
See Figure 6
2.7
V
V
OH
High-level output voltage V
ID
= 200 mV, I
OH
= −400 µA, See Figure 6 2.7 V
V
OL
Low-level output voltage
V
ID
= 200 mV,
I
OL
= 8 mA,
See Figure 6
0.45
V
V
OL
Low-level output voltage V
ID
= 200 mV, I
OL
= 8 mA, See Figure 6 0.45 V
I
OZ
High-impedance-state output
current
V
O
= 0.4 V to 2.4 V ± 20 µA
I
I
Line input current
Other input = 0 V,
V
I
= 12 V 1
mA
I
I
Line input current
Other input = 0 V,
See Note 5
V
I
= −7 V −0.8
mA
I
IH
High-level enable-input current V
IH
= 2.7 V −100 µA
I
IL
Low-level enable-input current V
IL
= 0.4 V −100 µA
r
I
Input resistance 12 kΩ
I
CC
Supply current
V
I
= 0 or V
CC
,
Receiver enabled and driver disabled 3.9
mA
I
CC
Supply current
V
I
= 0 or V
CC
,
No load
Receiver and driver disabled 0.25
mA
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
The algebraic convention, in which the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode
input voltage and threshold voltage levels only.
NOTE 5: This applies for both power on and power off. Refer to ANSI Standard RS-485 for exact conditions.